package com.gxa.hualian.controller;


import com.gxa.hualian.common.JsonResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.UUID;

/**
 * @author bill
 * @date 2021/10/21 15:48
 */
@RestController
public class UploadController {

    @RequestMapping("/upload")
    public Map upload(@RequestParam("file") MultipartFile multipartFile, HttpServletRequest request) throws IOException {
//QQ截图20200724153059.png
        String originalFilename = multipartFile.getOriginalFilename();
        System.out.println("originalFilename:"+originalFilename);
        // 从原始文件名中获取后缀,作为新添加的文件的文件名后缀(匹配)
        String subfix = originalFilename.substring(originalFilename.indexOf(".")+1);
        System.out.println("subfix:"+subfix);
        //使用UUID作为文件名,保证服务器中存放的文件名唯一

        String targetFile = UUID.randomUUID().toString().replace("-","")+"."+subfix;
        System.out.println("targetFile:"+targetFile);

        // 通过request获取当前程序的根路径"/"

        String path = request.getSession().getServletContext().getRealPath("/");

        String fileName = path+"/images/uploadImg/"+targetFile;
        System.out.println("fileName:"+fileName);

        // 构建文件对象
        File uploadFile = new File(fileName);
        //核心操作(含有异常操作, 利用异常设定状态码(和前端约定)
        // 此处应当和ExceptionController结合, 当try执行成功则设定状态码0
        // 出现异常则设定其他
        // 再将异常信息结合BusinessException抛出, 交给ExceptionController处理
        try {
            multipartFile.transferTo(uploadFile);
        } catch (IOException e) {
            //e.printStackTrace();
            throw e;
        }

        JsonResult jsonResult = new JsonResult();

        // 返回状态:1 表示上传成功
        jsonResult.setCode("1");
        // 返回服务器保存后的文件名
        jsonResult.put("fileName",targetFile);
        return jsonResult.getDataMap();



    }
}
